how to rebuild the "main.pak", if there is a way, could you please tell me?

You don't need to rebuild any pak files. Just open your game.ini file and put in a new path (you'll put everything into a folder), you can create as many paths as you want. Example: Search = .\CP3-Studio;.\CP3-Main;.\CP3-RfB;.\CP3-Staliningrad;.\CP3-Cherburg;; Now mod files will be searched in MyPanzersFolder\Run\CP3-Main\, etc.

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The other thing I have read is that you can place the skins into this folder "Panzers II\Run\Mods\units\walker", but I am not sure if I need to download some files to make mods work..

. As I said before you need to create a new path and add everything into that folder. So in your case you should create a new path called "Mods": Search = .\Mods;; You don't need to download anything, simply run Panzers_Phase_2_Mod.exe if you have modded your game.

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And the last thing is if could I change the stats of the unit, for example meelee attack or the way they walk or run...

Everything is done in the "unit" file. There is a very wide range of modifications available but you'll need to find out anything for yourself, because if I go into detail it will take a long long time. Maybe this tutorial I wrote will shed some light

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Oh! I could never make that the train tow the cars :S

Simply drag a car onto the locomotive while in the editor.

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Thanks for comprehension, as you can see this if my first post on this page. tongue